3.4 Viewing error messages

To view error messages belonging to the current line, use the
flymake-display-err-menu-for-current-line function. If there’s
at least one error or warning reported for the current line, this
function will display a popup menu with error/warning texts.
Selecting the menu item whose error belongs to another file brings
forward that file with the help of the
flymake-goto-file-and-line function.